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- /*
- * Copyright 2018 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef SkSafe32_DEFINED
- #define SkSafe32_DEFINED
- #include "include/core/SkTypes.h"
- static constexpr int32_t Sk64_pin_to_s32(int64_t x) {
- return x < SK_MinS32 ? SK_MinS32 : (x > SK_MaxS32 ? SK_MaxS32 : (int32_t)x);
- }
- static constexpr int32_t Sk32_sat_add(int32_t a, int32_t b) {
- return Sk64_pin_to_s32((int64_t)a + (int64_t)b);
- }
- static constexpr int32_t Sk32_sat_sub(int32_t a, int32_t b) {
- return Sk64_pin_to_s32((int64_t)a - (int64_t)b);
- }
- // To avoid UBSAN complaints about 2's compliment overflows
- //
- static constexpr int32_t Sk32_can_overflow_add(int32_t a, int32_t b) {
- return (int32_t)((uint32_t)a + (uint32_t)b);
- }
- static constexpr int32_t Sk32_can_overflow_sub(int32_t a, int32_t b) {
- return (int32_t)((uint32_t)a - (uint32_t)b);
- }
- #endif
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